Overview: 1. Double sealing, strong sealing performance. 2. Condensing seal design, sturdy and durable. 3. The surface pocket can write notes. 4. The smooth zipper can be manually sealed, or the top of the opening can be heat-sealed on the zipper to achieve the storage effect. 5. You can store coffee, rice, beans, tea, vanilla, spices, etc. for a period of time without deterioration. Specifications: Material: PE+PET Capacity: less than 300mL Microwave: Not available Shape: Cup type Specification: 4 pieces Product size: 11*19cm Package Content: 1 set of 4 fresh-keeping bags